Overview of changes between 0.1.0 and 0.2.0
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* Resync with upstream
  o add clutter.Behaviour API
  o allow implementing a clutter.Behaviour in pure python
  o add clutter.Alpha API
  o allow implementing the clutter.Media interface in pure python
* Clean up the build environment
  o split overridden functions per object/function
  o add clutter.gtk and clutter.gst sub-modules
  o add some public API for bindings of clutter-based libraries
